CN108934190A - The transmission mechanism of wireless communication system - Google Patents

The transmission mechanism of wireless communication system Download PDF

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Publication number
CN108934190A
CN108934190A CN201880001205.8A CN201880001205A CN108934190A CN 108934190 A CN108934190 A CN 108934190A CN 201880001205 A CN201880001205 A CN 201880001205A CN 108934190 A CN108934190 A CN 108934190A
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resource element
matrix
user equipment
reference signal
data
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CN108934190B (en
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庄乔尧
林松征
陈义升
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MediaTek Inc
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MediaTek Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H04B7/0473—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking constraints in layer or codeword to antenna mapping into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0486—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0697—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using spatial multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality

Abstract

The invention proposes a kind of methods of transmission mechanism based on two layers of (order (Rank)=2) demodulated reference signal (demodulation reference signal, DMRS).Pre-coding matrix on data RE can be expressed as AxB.Pre-coding matrix on UE specific reference signals DMRS is then A.Matrix B is common phase circular matrix.Order=2 are implemented on by the common phase circular matrix B that will be proposed and based on the transmission mechanism of DMRS, PDSCH EPRE is equal to 0dB to the ratio of DMRS EPRE, as required by LTE specification.In addition, UE channel estimating performance is improved when DMRS power is followed by pre-coding matrix A.

Description

The transmission mechanism of wireless communication system
Cross reference
Present application according to 35U.S.C. § 119 request from March 24th, 2017 submit and it is entitled The United States provisional application number 62/ of " Transmission Scheme for Wireless Communication Systems " 475,949 priority, and it is hereby incorporated herein by reference.
Technical field
The present invention relates to mobile communications networks.Particularly, the present invention relates to a kind of implementation pre-coding matrixes appropriate to change The method of kind channel estimation efficiency.
Background technique
Long Term Evolution (Long Term Evolution, LTE) is improved Universal Mobile Telecommunications System (Universal Mobile Telecommunications System, UMTS) provides higher data rate, lower Waiting time and improved power system capacity.In LTE system, evolved universal land face Radio Access Network (evolved Universal terrestrial radio access network) it include the multiple base stations for being referred to as enode (eNB), Multiple movement stations of itself and referred to as user equipment (user equipment, UE) are communicated.UE can via downlink and Uplink is communicated with base station or eNB.Downlink (DL) refers to the communication from base station to UE.Uplink (UL) is then Refer to the communication from UE to base station.LTE puts goods on the market usually as 4G LTE, and LTE standard is developed by 3GPP.
Spatial reuse (Spatial multiplexing) is multiple-input and multiple-output (multiple-input multiple- Output, MIMO) transmission technology in radio communication, it is known as data flow to send from each of multiple transmitting antennas Independence and the data-signal being separately encoded.Therefore, Spatial Dimension is repeatedly reused or is multiplexed.If transmitter is equipped with There is NtA antenna and receiver have NrA antenna, then if using linear one, maximum space multiplexing order (number According to the quantity of stream) it is Ns=min (Nt,Nr).This means that NsA data flow can ideally lead to frequency spectrum with parallel transmission The N of efficiencysIncrease again.
With NtA transmitting antenna and NrIn half-open circuit (semi-open-loop) mimo system of a receiving antenna, Input output Relationship can be described as yi=HiWi xi +ni , wherein i is resource element (resource element, RE) rope Draw,yi 、xi 、ni It is (the N of received symbol, the symbol through sending and noiset× 1) a vector, HiIt is channel coefficients (Nr ×Nt) matrix, WiIt is (the N on i-th of REt×Ns) Linear precoding matrix.Pre-coding matrix is used to carry out precoding to symbol To improve efficiency.When the pre-coding matrix on reference signal RE is identical as the pre-coding matrix on the data RE in resource block, Pre-coding matrix is obvious (transparent) for UE, therefore UE is without knowing W.On the other hand, and in resource block Reference signal on the different pre-coding matrix of pre-coding matrix can distribute to data RE.For example, in resource block, reference Pre-coding matrix on signal is W, and the pre-coding matrix on data RE is WUi.So UiEach RE index should be assigned to simultaneously It and for UE is non-obvious.
In LTE system, two exponent sheets (codebook) are defined for pre-coding matrix.Data RE will be implemented on Pre-coding matrix indicated by following equation (1), and be the obvious pre-coding matrix on reference signal (RS) for UE Become equation (2), and equation (3) is the common phase circular matrix (co-phasing cycling matrix) of data RE.
LTE has been directed to different transmitting scenes and has defined different transmission modes (transmission mode, TM). For transmission mode 9 or 10, UE specific reference signals (such as demodulated reference signal (demodulation reference Signal, DMRS) support up to 8 layers of transmission.For the TM based on DMRS, UE image assumes entity downlink sharied signal channel Energy (energy per in (physical downlink share channel, PDSCH) on each resource element Resource element, EPRE) to the ratio of the specific RS EPRE of UE in each OFDM symbol comprising the specific RS of UE, It is 0dB for the quantity of transport layer is less than or equal to two.However, based on the pre-coding matrix (equation (1)) on data RE With the pre-coding matrix (equation (2)) on the specific RS of UE, the ratio of PDSCH EPRE RS EPRE specific to UE is 3dB, this violation The specification of 0dB.In addition, will affect the channel estimation efficiency at receiver when DMRS power is lower.
Seek a solution.
Summary of the invention
Present application proposes a kind of based on two layers of (order (Rank)=2) demodulated reference signal (demodulation Reference signal, DMRS) transmission mechanism method.Pre-coding matrix on data RE can be expressed as AxB.UE is special Determining the pre-coding matrix on reference signal DMRS is A.Matrix B is common phase circular matrix.Pass through the common phase Cyclic Moment that will be proposed Battle array B is implemented on order=2 and the transmission mechanism based on DMRS, and PDSCH EPRE is equal to 0dB to the ratio of DMRS EPRE, as LTE is advised Required by lattice.In addition, UE channel estimation efficiency is improved when DMRS power is followed by pre-coding matrix A.
In one embodiment, BS is sent to user equipment (user equipment, UE) within a wireless communication network Downlink transmission scheduling information.BS sends the UE specific reference signals implemented with the first pre-coding matrix.This UE is specific Resource signal is to be allocated to UE and by predefined multiple demodulated reference signal (demodulation reference Signal, DMRS) resource element (resource element, RE) send demodulated reference signal (DMRS).BS passes through with The multiple data RE that two pre-coding matrixes are implemented send data-signal.This second pre-coding matrix can be by the first precoding square Battle array is indicated multiplied by common phase circular matrix.So that energy (the energy per resource on each resource element of data RE Element, EPRE) it is 0dB to the ratio of the EPRE of DMRS RE.
In another embodiment, UE is received from serving BS for downlink transmission within a wireless communication network Scheduling information.UE executes channel estimation by measuring the UE specific reference signals implemented with the first pre-coding matrix.This UE is special Determining resource signal is provided in predefined multiple demodulated reference signals (demodulation reference signal, DMRS) The demodulated reference signal (DMRS) sent on source element (resource element, RE).UE is received and is decoded pre- with second The data-signal on multiple data RE that encoder matrix is implemented.This second pre-coding matrix can by the first pre-coding matrix multiplied by Common phase circular matrix indicates.Finally, UE exports data-signal by using common phase circular matrix, so that each of data RE Energy (energy per resource element, EPRE) on resource element is 0dB to the ratio of the EPRE of DMRS RE.
Other embodiments and advantage will describe in following detailed description.The content of present invention is not intended to define this hair It is bright.The present invention is defined by the claims.
Detailed description of the invention
Fig. 1 shows according to an innovative teachings, there is the MIMO for two layers of UE specific reference signals DMRS transmission mode The mobile communications network of precoding.
Fig. 2 indicates to execute the base station of certain embodiments of the present invention and the simplification block diagram of user equipment.
Fig. 3 is indicated according to an innovative teachings, from the downlink using DMRS transmission mode from the point of view of the angle of base station MIMO transmission program.
Fig. 4 is indicated according to an innovative teachings, from the downlink mimo using DMRS transmission mode from the point of view of UE angle Transmission process.
Fig. 5 indicates the sequential flow for two layers of (order (Rank)=2) spatial multiplexing transmission and the transmission architecture based on DMRS Journey.
Fig. 6 is according to an innovative teachings, from the point of view of BS angle, the stream of the method for precoding of the transmission based on two layers of DMRS Cheng Tu.
Fig. 7 is according to an innovative teachings, from the point of view of UE angle, the stream of the method for precoding of the transmission based on two layers of DMRS Cheng Tu.
Specific embodiment
The example of multiple embodiments of the invention will be hereinafter explained referring to correlative type.
Fig. 1 shows according to an innovative teachings, there is the transmission mode for two layers of UE specific reference signals DMRS The mobile communications network 100 of MIMO precoding.Mobile communications network 100 be include serving BS eNB 101, the first user equipment The OFDM network of 102 (UE#1) and second user equipment 103 (UE#2).In the 3GPP LTE system based on OFDMA downlink In, radio resource is divided into time frame (subframe) in the time domain, and each time frame is made of two time slots.Each OFDMA symbol depends on system bandwidth and is made of multiple OFDMA subcarriers in frequency domain.The basic unit of resource grid is known as Resource element (resource element, RE) crosses over OFDMA subcarrier with an OFDMA symbol.RE is classified as resource Block (resource block, RB), wherein each RB is made of 12 continuous subcarriers in a time slot.
Multiple entity downlink channel and reference signal are defined to use carrying from one group of money of the information of higher level Source element.For downlink channel, entity downlink sharied signal channel (physical downlink share Channel, PDSCH) it is key data bearing downlink link channel in LTE, and entity downlink control channel (physical downlink control channel, PDCCH) is then for the bearing downlink link control message in LTE (downlink control information, DCI).Control information may include that scheduling determines, has with reference signal information The information of pass, formation will be by the rules and power of the PDSCH corresponding transport block (transport block, TB) carried Control command.For reference signal, UE utilizes the specific reference signal of cell (cell-specific reference Signal, CRS) in control/data channel solution non-precoded or in the transmission mode based on codebook precoding The measurement of modulation, radio link monitoring and channel state information (channel state information, CSI) feedback.UE Using UE specific reference signals (DMRS) for control/data channel solution in the transmission mode for being not based on codebook precoding Modulation.
Consider the multiple-input and multiple-output (multiple-input of the downlink of emulation cellular mobile telecommunication system 100 Multiple-output, MIMO) channel.BS is equipped with NtA transmitting antenna, and K UE respectively has NrA receiving antenna. At m- frequency resource elements for the moment, BS passes through B spatial beams (B≤N to L (L≤K) UE by linear predictive codingt) To execute MIMO transmission.In the example of fig. 1, TX antenna emits four space crossfires, wherein each receiver corresponds to two skies Between crossfire.Coefficient h11、h12、h13And h14It indicates from x1Antenna reaches y1、y2、y3And y4The transmission of antenna.Coefficient h21、h22、h23With h24It indicates from x2Antenna reaches y1、y2、y3And y4The transmission of antenna.Coefficient h31、h32、h33And h34It indicates from x3Antenna reaches y1、 y2、y3And y4The transmission of antenna.Finally, coefficient h41、h42、h43And h44It represents from x4Antenna reaches y1、y2、y3And y4The biography of antenna It is defeated.Transmission from each of four TX antennas reaches each of four RX antennas.For two layers (order (Rank)= 2) for spatial multiplexing transmission, received signal can be indicated are as follows:
Wherein,
I is RE index
HiFor channel response matrix
WiFor pre-coding matrix
d0,iSignal is transmitted for layer -0
d1,iSignal is transmitted for layer -1
yiFor the signal received
niFor noise
In LTE system, two exponent sheets (codebook) are defined for pre-coding matrix.Data RE will be implemented on Pre-coding matrix be following equation (1), be obvious demodulated reference signal (demodulation for UE Reference signal, DMRS) on pre-coding matrix be equation (2), and for RE level processing common phase circulation Predefined matrix becomes following equation (3):
Wherein,
P=2N1N2, it is defined as the quantity at the port CSI-RS, wherein N1And N2It is the first dimension and the second dimension respectively In with identical polarized antenna port quantity.
νl,mIs defined as:
Wherein, 1 and m are the index of PMI code book.
Is defined as:
Wherein, n is the index of the common phase factor.
LTE has been directed to different transmitting scenes and has defined different transmission modes (transmission mode, TM). For transmission mode 9 or 10, the specific demodulated reference signal of UE (DMRS) supports up to 8 layers of transmission.For being based on DMRS TM for, UE image assume entity downlink sharied signal channel (physical downlink share channel, PDSCH the energy (energy per resource element, EPRE) in) on each resource element is to specific comprising UE The ratio of the specific RS EPRE of UE in each OFDM symbol of RS, for the quantity of transport layer be less than or equal to two for be 0dB.However, based on the pre-coding matrix (equation (1)) on data RE and the pre-coding matrix (equation (2)) in reference signal, PDSCH EPRE RS EPRE ratio specific to UE is 3dB, and this violates the specifications of 0dB.In addition, when DMRS power is lower, it will Influence the channel estimation efficiency at receiver.
According to an innovative teachings, for two layers (order (Rank)=2) and transmission mechanism based on DMRS, will implement It is indicated on the pre-coding matrix of data RE is equivalent by following equation (4), is being obvious reference signal for UE (RS) pre-coding matrix on becomes equation (5), and the predefined matrix of the common phase circulation for the processing of RE level is modified For following equation (6), and:
Wherein,
P=2N1N2, it is defined as the quantity at the port CSI-RS, wherein N1And N2It is the first dimension and the second dimension respectively In with identical polarized antenna port quantity.
νl,mIs defined as:
Wherein, 1 and m are the index of PMI code book.
Is defined as:
Wherein, n is the index of common phase factor.
Order (Rank)=2 is implemented on and based on the transmission of DMRS by the common phase circular matrix (equation (6)) that will be proposed Mechanism, and as required by LTE specification, the ratio of PDSCH EPRE RS EPRE specific to UE is equal to 0dB.In addition, working as DMRS function When rate is higher (equation (5)), channel estimation efficiency can be improved.
Fig. 2 indicates base station 201 and user equipment that certain embodiments of the present invention is executed in mobile communications network 200 211 simplification block diagram.For base station 201, antenna 221 sends and receives radio signal.It is received with the RF of antenna coupling It sends out device module 208 and receives the RF signal from antenna, convert them to fundamental frequency signal, and send them to processor 203. RF transceiver 208 is also converted to the fundamental frequency signal received from processor for RF signal, and is sent to antenna 221.Place Reason device 203 handles the fundamental frequency signal received and calls different functional modules to execute feature in base station 201.Memory 202 Program instruction and data 209 are stored, with the operation of control base station.There are similar configurations in UE 211, wherein antenna 231 is sent out Send and receive RF signal.The RF signal from antenna is received with the RF transceiver module 218 of antenna coupling, converts them to base Frequency signal, and send them to processor 213.RF transceiver 218 also turns the fundamental frequency signal received from processor It is changed to RF signal, and is sent to antenna 231.Processor 213 handles the baseband signal received and calls different function moulds Block block is to execute feature in UE 211.Memory 212 stores program instruction and data 219, to control the operation of UE.
Base station 201 and UE 211 further include multiple functional modules and circuit to execute some embodiments of the present invention.It is different Functional module be can by software, firmware, hardware, or any combination thereof come the circuit that configures and realize.When by processor 203 When executing with 213 (for example, by executing program 209 and 219), functional module and circuit for example allow the scheduling of base station 201 (to pass through Scheduler 204), precoding (passing through precoder 205), coding (passing through MIMO coding circuit 206) and send control/match Information and date (by control/configuration circuit 207) is set to UE 211, and allow UE 211 to receive, decoding is (by MIMO electricity Road 216) and beam forming (beamform) (passing through beamforming circuitry 215) control/configuration information and data (pass through control System/configuration circuit 217), and correspondingly execute channel estimation (passing through measurement/estimating circuit 220).In one example, base station 201 are implemented on the common phase circular matrix proposed (equation (6)) based on order (Rank)=2 and based on the transmission architecture of DMRS, And as required by LTE specification, the ratio of PDSCH EPRE RS EPRE specific to UE is equal to 0dB.In addition, when DMRS power compared with When high (equation (5)), channel estimation efficiency can be improved.
Fig. 3 is indicated according to an innovative teachings, from the downlink using DMRS transmission mode from the point of view of the angle of base station MIMO transmission program.Fig. 3 describes data precoding and reference signal precoding.For data precoding, in step 311, BS is encoded from input signal by MIMO and is generated two layer datas.Then in step 312 by data precoding matrix to layer -0 and - 1 data of layer carry out precoding, then via including mutiple antennas 0 to 2N1N2- 1 two-dimensional antenna array will prelist yardage According to being sent to UE.Data precoding matrix is by 310 descriptions, for example, being indicated by equation (4).Data precoding matrix can be written as A × B, wherein A is 2N1N2Matrix (equation (5)), and B is 2 × 2 matrixes (equation (6)).In precoding resource block group In (precoding resource block group, PRG), each RE implements identical matrix A, and for each RE, square Battle array B is based on RE index and changes.Matrix B is also referred to as common phase circular matrix, and is assigned to each RE index.
For UE specific reference signals DMRS precoding, in step 321, BS uses code division multiplexing (code division Multiplexing, CDM) generate two layers of DMRS.Then in step 322 by DMRS pre-coding matrix to layer -0 and layer - 1DMRS carries out precoding, then sends out the DMRS of precoding via the two-dimensional antenna array for including mutiple antennas 0 to 2N1N2-1 It is sent to UE.DMRS pre-coding matrix can be written as A (equation (5)), identical as the A in data precoding.In PRG, each RE implements identical matrix A in DMRS precoding.
Fig. 4 indicates always to be made from from the point of view of user equipment (user equipment, UE) angle according to an innovative teachings With the downlink MIMO transmission program of DMRS transmission mode.UE services BS from it and receives downlink scheduling to be used for downlink chain Circuit-switched data transmission, wherein UE specific reference signals DMRS is sent on predefined RE, and data-signal is in remaining scheduling RE Upper transmission.In step 411, UE from its RF module receive analog signal, and by analog-digital converter (ADC) circuit by its Be converted to digital signal.In step 412, it is handled by Fast Fourier Transform (FFT) (Fast Fourier Transform, FFT) Circuit handles digital signal.In step 421, UE executes channel estimation by using DMRS.Specifically, for each DMRS RE, UE estimate the H of i-th of (ith) REi×A.In step 422, UE is also by exporting estimating for i-th of RE multiplied by B Count channel value, and B be by equation (6) represented by common phase circular matrix.It note that each DMRS from a PRG is seen The equivalent channel observed is Hk× A, dimension are Nr× 2, wherein NrIt is UE receiving antenna number, and HkIt is k-th (kth) The channel response matrix of DMRS.
Fig. 5 indicate for two layers of (order (Rank)=2) MIMO spatial multiplexing transmission and the transmission architecture based on DMRS it is suitable Sequence process.In step 511, downlink schedule information is sent UE 502 by BS 501.Downlink schedule information includes Down link control information (downlink control information, DCI) on candidate PDCCH, is used for PDSCH Correspondence downlink transmission.The DCI of different-format in the downlink from different transmission modes and resource allocation type chain It connects.In step 512, BS 501 sends UE specific reference signals DMRS to UE 502 on predefined RE.DMRS is to prelist Code matrix A is implemented.In step 513, BS 501 sends data-signal to UE 502 on remaining scheduling RE.Data-signal Implemented with pre-coding matrix A × B.It note that DCI, DMRS and data-signal can be sent out in identical downlink transmission It send, but can not be sent in different resource locations.In step 521, UE 502 receive downlink transmission and by using DMRS executes channel estimation.Specifically, UE 502 estimates the channel H of i-th of REi×A.In step 522, UE 502 is gone back By the data-signal for exporting i-th of RE multiplied by predefined common phase circular matrix B.It note that under the precoding of suggestion The transmission power of DMRS improvesTimes.In addition, the common phase circular matrix of the data RE under the precoding proposed is scaledTimes.Therefore, the EPRE of the data on PDSCH is equal to 0dB to the ratio of the EPRE of DMRS, meets LTE specification.
Fig. 6 is according to an innovative teachings, from the point of view of BS angle, the stream of the method for precoding of the transmission based on two layers of DMRS Cheng Tu.In step 601, BS sends user for the scheduling information for being used for downlink transmission within a wireless communication network and sets Standby (user equipment, UE) network.In step 602, BS is sent with the first pre-coding matrix the specific ginseng of UE implemented Examine signal, wherein UE specific resources signal is to be allocated to UE and in multiple predefined (demodulation reference Signal, DMRS) demodulated reference signal (DMRS) that sends on resource element (resource element, RE).In step 603 In, BS is by sending data-signal with the second pre-coding matrix come the data RE that implements, wherein the second pre-coding matrix can be by First pre-coding matrix is indicated multiplied by common phase circular matrix, and the wherein energy on each resource element of data RE (energy per resource element, EPRE) is 0dB to the ratio of the EPRE of DMRS RE.
Fig. 7 is according to an innovative teachings, from the point of view of UE angle, the stream of the method for precoding of the transmission based on two layers of DMRS Cheng Tu.In step 701, UE receives the scheduling letter for downlink transmission within a wireless communication network from serving BS Breath.In a step 702, UE executes channel estimation by measuring the UE specific reference signals implemented with the first pre-coding matrix, Wherein, UE specific resources signal is sent on multiple predefined DMRS resource elements (resource element, RE) Demodulated reference signal (demodulation reference signal, DMRS).In step 703, UE receive and decode with The data-signal on multiple data RE that second pre-coding matrix is implemented.Second pre-coding matrix can be by the first pre-coding matrix It is indicated multiplied by common phase circular matrix.In step 704, UE exports data-signal by using common phase circular matrix, wherein Energy (energy per resource element, EPRE) on each resource element of data RE is to the EPRE of DMRS RE Ratio be 0dB.
The present invention is described although having been combined for instructing certain specific embodiments of purpose, the present invention is unlimited In this.Therefore, in the case where not departing from the scope of the present invention described in claim, described embodiment can be practiced Various features various modifications, reorganization and combination.

Claims (20)

1. a kind of method, comprising:
Network sends the scheduling information for downlink transmission within a wireless communication network from serving BS to user equipment；
Send the user equipment specific reference signals implemented with the first pre-coding matrix, wherein user equipment specific resources letter It number is the demodulated reference signal to be allocated to the user equipment and being sent by predefined demodulated reference signal resource element；With And
Data-signal is sent by the data resource element implemented with the second pre-coding matrix, wherein the second precoding square Battle array can indicate by first pre-coding matrix multiplied by common phase circular matrix, and wherein, each of the data resource element Energy on resource element is 0dB to the ratio of the energy on each resource element of the demodulated reference signal resource element.
2. the method as described in claim 1, which is characterized in that the scheduling information is held by entity downlink control channel It carries.
3. the method as described in claim 1, which is characterized in that the base station increases the demodulation by first pre-coding matrix The transmission power of reference signal resource element, so that user device channel estimation efficiency is improved.
4. method as claimed in claim 3, which is characterized in that first pre-coding matrix be defined in code book and with's The factor scales, and wherein, P is defined as the quantity of the port for reference signal.
5. the method as described in claim 1, which is characterized in that the common phase circular matrix is according to corresponding data resource element rope Draw and is predefined to each data resource element.
6. method as claimed in claim 5, which is characterized in that the common phase circular matrix is that have altogether to the 2 × 2 of factor elements Matrix, and wherein, the common phase circular matrix withThe factor scale.
7. a kind of method, comprising:
Scheduling information from serving BS for downlink transmission within a wireless communication network is received by user equipment；
Channel estimation is executed by measuring the user equipment specific reference signals implemented with the first pre-coding matrix, wherein should User equipment specific resources signal is the demodulated reference signal sent on predefined demodulated reference signal resource element；
Decode the data-signal on the data resource element implemented with the second pre-coding matrix, wherein the second precoding square Battle array can be indicated by first pre-coding matrix multiplied by common phase circular matrix；And
The data-signal is exported by using the common phase circular matrix, wherein each resource element of the data resource element On energy be 0dB to the ratio of the energy on each resource element of the demodulated reference signal resource element.
8. the method for claim 7, which is characterized in that the scheduling information is held by entity downlink control channel It carries.
9. the method for claim 7, which is characterized in that when being sent out by first pre-coding matrix with increased power When giving the demodulated reference signal, which improves channel estimation efficiency.
10. method as claimed in claim 9, which is characterized in that first pre-coding matrix be defined in code book and with's The factor scales, and wherein, P is defined as the quantity of the port for reference signal.
11. the method for claim 7, which is characterized in that the common phase circular matrix be according to corresponding data RE index and It is predefined to each data resource element.
12. method as claimed in claim 11, which is characterized in that the common phase circular matrix is that have altogether to the 2 of factor elements × 2 matrixes, and wherein, the common phase circular matrix withThe factor scale.
13. the method for claim 7, which is characterized in that the downlink transmission is two layers of biography with spatial reuse It is defeated.
14. a kind of user equipment, comprising:
Radio frequency receiver receives the scheduling information from serving BS for the downlink transmission in cordless communication network；
Channel estimation circuit executes channel by measuring the user equipment specific reference signals implemented with the first pre-coding matrix Estimation, wherein the user equipment specific resources signal is the demodulation sent on predefined demodulated reference signal resource element Reference signal；And
Decoder decodes data-signal on the data resource element implemented with the second pre-coding matrix, wherein this is second in advance Encoder matrix can be indicated by first pre-coding matrix multiplied by common phase circular matrix, and wherein, be followed by using the common phase Ring matrix exports the data-signal, so that the energy on each resource element of the data resource element believes the demodulation reference The ratio of energy on each resource element of number resource element is 0dB.
15. user equipment as claimed in claim 14, which is characterized in that the scheduling information is by entity downlink control channel To carry.
16. user equipment as claimed in claim 14, which is characterized in that when by first pre-coding matrix with increased function Rate is come when sending the demodulated reference signal, which improves channel estimation efficiency.
17. user equipment as claimed in claim 16, which is characterized in that first pre-coding matrix be defined in code book and withThe factor scale, and wherein, P is defined as the quantity of the port for reference signal.
18. user equipment as claimed in claim 14, which is characterized in that the common phase circular matrix is according to corresponding data RE rope Draw and is predefined to each data resource element.
19. user equipment as claimed in claim 18, which is characterized in that the common phase circular matrix is that have altogether to factor elements 2 × 2 matrixes, and wherein, the common phase circular matrix withThe factor scale.
20. user equipment as claimed in claim 14, which is characterized in that the downlink transmission is two with spatial reuse Layer transmission.
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